The Saris® Fluid² Trainer is a large, precision-balanced flywheel that allows you to easily customize each ride simply by shifting gears, just as you would outside. This design, with a patented fan, helps keep your Fluid² working better – longer. With a built-to-last manufacturing process, the Fluid² will let you get the most out of your indoor training rides. DESIGN: PowerTuned for optimal road-like feel Eccentric leveling feet allow for easy adjustment on uneven surfaces Comes on foldable Classic frame with spring loaded, bolt-action lever Features clutch knob for perfect roller to tire tension each ride 2” resistance unit roller allows for 650b, 700c, 26”, 27” and 29” wheel sizes – up to a 2.0 tire Connects to rear wheel of bike, no need to remove wheel or disassemble bike Alloy, precision-machined alloy resistance roller reduces tire wear and slippage Designed to fit common road and mountain bike frames Fluid resistance unit provides a quiet and consistent ride Progressive resistance offers the widest resistance range and road-like feel Compatible with Zwift and other indoor cycling apps Best-selling trainer in the USA Max Weight (Rider and Bike): 300 lbs.